WORDS. Therefore, it must be changed into Indirect Speech.We notice that the reporting verb is in the PAST tense (‘SAID’). Hence, a change will be made in the tense of the reported speech.Also, the first person of the reported speech is changed according to the subject of reporting speech.In the given question, the verb ‘are’ is changed to 'were' and ‘these’ is changed to ‘those’.Therefore, the sentence in Indirect Speech will be option 4 i.e. He told the bankers that those diamonds were more VALUABLE than a billion dollars.